From 5c60d25fa1b22fdcf141f8006d31c32b08db7311 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Mon, 9 Feb 2015 05:37:47 -0800 Subject: [PATCH] rcu: Add diagnostics to grace-period cleanup At grace-period initialization time, RCU checks that all quiescent states were really reported for the previous grace period. Now that grace-period cleanup has been split out of grace-period initialization, this commit also performs those checks at grace-period cleanup time. Signed-off-by: Paul E. McKenney --- kernel/rcu/tree.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index d5247ed44004..17b5abf999ca 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1920,6 +1920,8 @@ static void rcu_gp_cleanup(struct rcu_state *rsp) rcu_for_each_node_breadth_first(rsp, rnp) { raw_spin_lock_irq(&rnp->lock); smp_mb__after_unlock_lock(); + WARN_ON_ONCE(rcu_preempt_blocked_readers_cgp(rnp)); + WARN_ON_ONCE(rnp->qsmask); ACCESS_ONCE(rnp->completed) = rsp->gpnum; rdp = this_cpu_ptr(rsp->rda); if (rnp == rdp->mynode)